Which of the following is an irrational number?

Which of the following is an irrational number?

Step 1: Understand what an irrational number is. An irrational number cannot be expressed as a simple fraction (like 1/2 or 3/4).
Step 2: Look at the first option, √4. Calculate √4, which equals 2. Since 2 can be written as 2/1, it is a rational number.
Step 3: Look at the second option, 0.25. This can be written as 1/4, which is a fraction. Therefore, 0.25 is a rational number.
Step 4: Look at the third option, 1. This can also be written as 1/1, making it a rational number.
Step 5: Look at the last option, √2. This number cannot be expressed as a fraction. Therefore, it is an irrational number.
Step 6: Conclude that the only irrational number from the options given is √2.

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